Discovery of transiting extrasolar planets (exoplanets) in between 1999 to 2012.
Point size scales with surface gravity (larger surface gravity mean smaller points).
Color of points represents temperature: hot planets are red, cold planets are blue.
Pitch of the sound represents the mass of the planet, tweaked on to the chromatic scale.
Planets beep when they transit (timescale scaled down by a large factor).
Squares are space-based discoveries, circles are ground-based discoveries.
13 years is compressed into 60 seconds, plus 15 second padding at the end.